Eprom Load, Ram Load.... No run.
TJHJ
Posts: 243
So yesterday this board a USB Proto board, was working fine, It was stored in my garage overnight, we have been seeing sub freezing tempatures here, and the garage is not well insulated. My 1st suspect was a too cold of cystal so I warmed it slightly using my hand. After turning on the heat in the garage I noticed some small condensatation, on the board, and apartus.
But I can reload the program to both ram and e-prom with out any errors. But it does not run at all....
Any ideas similar problems? Is the prop sensitive to cold weather? I saw the heat test on You tube, where they had one being cooked and it was fine....
Thanks for the help as always
TJ
But I can reload the program to both ram and e-prom with out any errors. But it does not run at all....
Any ideas similar problems? Is the prop sensitive to cold weather? I saw the heat test on You tube, where they had one being cooked and it was fine....
Thanks for the help as always
TJ
Comments
If the RCFAST program works, try reseating the crystal after cleaning (wiping) under it in case there was some debris that got on the board.
Condensation? When it was dead, I put a scope on the crystal, and it was working. I connected the scope to the socket side to also check connections.
It would be nice to nail this down so I can prevent it in the future.
Grasshopper curiosity, what takes a liquid cooled prop, I cant ever seem to make one ever generate enough heat to effect it.
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TJ
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Can you put it in a waterproof case?
TJ
Actually water is not conductive. Its the impurities in the water that is making it seem as though it is conducting. There is not enough valance electrons to conduct electricity (under normal conditions) thus it makes a fairly decent insulator.
Don't mean to be picky or not trying to offend, but some people may get misguided in that statement.
@TJHJ
I am using a conformal coating on my liquid cooled prop similar as to what you mentioned. It seems to be working very well. Its easy to apply and inexpensive.
Post Edited (grasshopper) : 1/1/2009 6:40:15 AM GMT
It escapes me how you are managing to generate heat from the Propeller.
I can see it from the mosfet, but the Propeller?
I asked Chip at the expo about whether the PropII would require some sort
of heatsink or cooling. He strongly indicated this would not
be the case as his design does not waste energy in the form of heat.
Kinda gives you some real insight about CPU design doesn't it?
OBC
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Sorry for misleading you.
To put it more clearly I have some Ic's in a close proximity to each other where some generate tremendous heat (especially the MosFet IC - 30Amps). The heat that is generated will begin to heat the surrounding parts quickly and thus I would loose my accuracy especially from the AtoD converter (16bits over 5volts). I overcome this by placing a liquid cooled heat exchanger over most of the circuit board that is populated with the propeller and other important Ic's. I am using the quad package that the propeller comes in - the size of the heat exchanger is under 1.75" square so it covers the parts well.
All I was stating earlier is that I am liquid cooling the propeller (and other IC's) and I have never had it fail yet. I have seen condensation and cooled it below -10c with no problems.